Texas Instruments TL1451AQDR, TL1451AQD, TL1451AMJB, TL1451AMJ, TL1451AMFKB Datasheet

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

1

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

D

Complete PWM Power Control Circuitry

D

Completely Synchronized Operation

D

Internal Undervoltage Lockout Protection

D

Wide Supply Voltage Range

D

Internal Short-Circuit Protection

D

Oscillator Frequency . . . 500 kHz Max

D

Variable Dead Time Provides Control Over
Total Range

D

Internal Regulator Provides a Stable 2.5-V
Reference Supply

D

Available in Q-Temp Automotive

HighRel Automotive Applications
Configuration Control / Print Support
Qualification to Automotive Standards

description

The TL1451A incorporates on a single monolithic
chip all the functions required in the construction
of two pulse-width-modulation (PWM) control
circuits. Designed primarily for power-supply
control, the TL1451A contains an on-chip 2.5-V
regulator, two error amplifiers, an adjustable
oscillator, two dead-time comparators, undervol­tage lockout circuitry, and dual common-emitter
output transistor circuits.

The uncommitted output transistors provide
common-emitter output capability for each
controller. The internal amplifiers exhibit a common-mode voltage range from 1.04 V to 1.45 V. The dead-time
control (DTC) comparator has no offset unless externally altered and can provide 0% to 100% dead time. The
on-chip oscillator can be operated by terminating RT and CT. During low V

CC

conditions, the undervoltage

lockout control circuit feature locks the outputs off until the internal circuitry is operational.
The TL1451AC is characterized for operation from –20°C to 85°C. The TL1451AQ is characterized for operation

from –40°C to 125°C. The TL1451AM is characterized for operation from –55°C to 125°C.

AVAILABLE OPTIONS

PACKAGED DEVICES

T

A

SMALL

OUTLINE

(D)

SMALL

OUTLINE

(DB)

†

PLASTIC DIP

(N)

SMALL

OUTLINE

(NS)

TSSOP

(PW)

†

CHIP

CARRIER

(FK)

CERAMIC

DIP

(J)

–20°C to 85°C — TL1451ACDB TL1451ACN TL1451ACNS TL1451ACPW — —
–40°C to 125°C TL1451AQD — — — — — —
–55°C to 125°C — — — — — TL1451AMFK TL1451AMJ

†

The DB and PW packages are only available left-end taped and reeled (add LE suffix, i.e., TL1451ACPWLE).

Copyright  1999, Texas Instruments Incorporated

PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

1
2
3
4
5
6
7
8

16
15
14
13
12
11
10

9

CT
RT

ERROR 1IN+

AMPLIFIER 1 1IN–

1FEEDBACK

1DTC
1OUT

GND

REF
SCP
2IN+ ERROR
2IN– AMPLIFIER 2
2FEEDBACK
2DTC
2OUT
V

CC

D, DB, N, NS, PW, OR J PACKAGE

(TOP VIEW)

1920132

17

18

16
15
14

1312119 10

5

4

6
7
8

2IN+
2IN–
NC
2FEEDBACK
2DTC

1IN+
1IN–

NC

1FEEDBACK

IDTC

RTCTNC

REF

SCP

GND

NC

V

OUT

1OUT

FK PACKAGE

(TOP VIEW)

CC

On products compliant to MIL-PRF-38535, all parameters are tested
unless otherwise noted. On all other products, production
processing does not necessarily include testing of all parameters.

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

2

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

functional block diagram

+
–

+
–

Oscillator

Reference

Voltage

1/2 V

ref

R
S

170 kΩ UVLO

R

92 1

VCCRT CT

10

16

7

8

REF

GND

PWM
COMP

PWM
COMP

12 kΩ

11

14
13
12

5

15

3
4

6

2 DTC

IN+
IN–

2 FEEDBACK

1 FEEDBACK

SCP

IN+
IN–

1 DTC

ERROR

AMPLIFIER 2

ERROR

AMPLIFIER 1

1 OUTPUT

2 OUTPUT

COMPONENT COUNT

Resistors 65
Capacitors 8
Transistors 105
JFETs 18

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

3

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

absolute maximum ratings over operating free-air temperature range

†

Supply voltage, VCC 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Amplifier input voltage, VI 20 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Collector output voltage, VO 51 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Collector output current, I

O

21 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Continuous power total dissipation See Dissipation Rating Table. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Operating free-air temperature range, TA C suffix –20°C to 85°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Q suffix –40°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

M suffix –55°C to 125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Storage temperature range, T

stg

–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Lead temperature 1,6 mm (1/16 inch) from case for 10 seconds 260°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

†

Stresses beyond those listed under “absolute maximum ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated under “recommended operating conditions” is not
implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

DISSIPATION RATING TABLE

PACKAGE

TA ≤ 25°C

POWER RATING

DERATING FACTOR

ABOVE TA = 25°C

TA = 70°C

POWER RATING

TA = 85°C

POWER RATING

TA = 125°C

POWER RATING

D 1088 mW 8.7 mW/°C 696 mW 566 mW 218 mW

DB 775 mW 6.2 mW/°C 496 mW 403 mW —

N 1000 mW 8.0 mW/°C 640 mW 520 mW —

NS 500 mW 4.0 mW/°C 320 mW 260 mW —

PW 838 mW 6.7 mW/°C 536 mW 436 mW 168 mW

FK 1375 mW 11.0 mW/°C 880 mW 715 mW 275 mW

J 1375 mW 1 1.0 mW/°C 880 mW 715 mW 275 mW

recommended operating conditions

MIN MAX UNIT

Supply voltage, V

CC

3.6 50 V

Amplifier input voltage, V

I

1.05 1.45 V

Collector output voltage, V

O

50 V

Collector output current, I

O

20 mA
Current into feedback terminal 45 µA
Feedback resistor, R

F

100 kΩ

Timing capacitor , C

T

150 15000 pF

Timing resistor , R

T

5.1 100 kΩ

Oscillator frequency 1 500 kHz

C suffix –20 85

Operating free-air temperature, T

A

Q suffix –40 125

°C

M suffix –55 125

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

4

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

Output voltage (pin 16) IO = 1 mA 2.4 2.5 2.6 V

p

p

TA = –20°C to 25°C –0.1% ±1%

Output voltage change with temperature

TA = 25°C to 85°C –0.2% ±1%
Input voltage regulation VCC = 3.6 V to 40 V 2 12.5 mV
Output voltage regulation IO = 0.1 mA to 1 mA 1 7.5 mV
Short-circuit output current VO = 0 3 10 30 mA

†

All typical values are at TA = 25°C.

undervoltage lockout section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

Upper threshold voltage (VCC) 2.72 V
Lower threshold voltage (VCC)

°

2.6 V

Hysteresis (VCC)

I

O(ref)

= 0.1 mA,

T

A

=

25°C

80 120 mV

Reset threshold voltage (VCC) 1.5 1.9 V

†

All typical values are at TA = 25°C.

short-circuit protection control section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Input threshold voltage (SCP) TA = 25°C 0.65 0.7 0.75 V
Standby voltage (SCP) No pullup 140 185 230 mV
Latched input voltage (SCP) No pullup 60 120 mV
Input (source) current VI = 0.7 V, TA = 25°C –10 –15 –20 µA
Comparator threshold voltage (FEEDBACK) 1.18 V

†

All typical values are at TA = 25°C.

oscillator section

TL1451C

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Frequency CT = 330 pF, RT = 10 kΩ 200 kHz
Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 10%
Frequency change with voltage VCC = 3.6 V to 40 V 1%

p

TA = –20°C to 25°C –0.4% ±2%

Frequency change with temperature

TA = 25°C to 85°C –0.2% ±2%

†

All typical values are at TA = 25°C.

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

5

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

dead-time control section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Input bias current (DTC) 1 µA
Latch mode (source) current (DTC) TA = 25°C –80 –145 µA
Latched input voltage (DTC) IO = 40 µA 2.3 V

p

Zero duty cycle 2.05 2.25

Input threshold voltage at f

= 10 kHz

(DTC)

Maximum duty cycle 1.2 1.45

V

†

All typical values are at TA = 25°C.

error-amplifier section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Input offset voltage VO (FEEDBACK) = 1.25 V ±6 mV
Input offset current VO (FEEDBACK) = 1.25 V ±100 nA
Input bias current VO (FEEDBACK) = 1.25 V 160 500 nA

1.05

Common-mode input voltage range VCC = 3.6 V to 40 V

1.05

to

V

gg

CC

1.45
Open-loop voltage amplification RF = 200 kΩ 70 80 dB
Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing V

ref

–0.1 V
Negative output voltage swing 1 V
Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V 0.5 1.6 mA
Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V –45 –70 µA

†

All typical values are at TA = 25°C.

output section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Collector off-state current VO = 50 V 10 µA
Output saturation voltage IO = 10 mA 1.2 2 V
Short-circuit output current VO = 6 V 90 mA

†

All typical values are at TA = 25°C.

pwm comparator section

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

Zero duty cycle 2.05 2.25

Input threshold voltage at f

= 10 kHz

(FEEDBACK)

Maximum duty cycle 1.2 1.45

V

†

All typical values are at TA = 25°C.

total device

TL1451AC

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C.

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

6

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

electrical characteristics over recommended operating free-air temperature range, VCC = 6 V,
f = 200 kHz (unless otherwise noted)

reference section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

p

p

TA = 25°C 2.40 2.50 2.60

Output voltage (pin 16)

I

O

= 1

mA

TA = MIN and 125°C 2.35 2.46 2.65

V

Output voltage change with temperature –0.63% *±4%

TA = 25°C 2.0 12.5

Input voltage regulation VCC = 3.6 V to 40 V

TA = 125°C 0.7 15

mV
TA = MIN 0.3 30
TA = 25°C 1.0 7.5

Output voltage regulation IO = 0.1 mA to 1 mA

TA = 125°C 0.3 14

mV
TA = MIN 0.3 20

Short-circuit output current VO = 0 3 10 30 mA

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

undervoltage lockout section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN

TYP

†

MAX

UNIT

TA = 25°C 2.72

Upper threshold voltage (VCC)

TA = 125°C 1.70

V
TA = MIN 3.15
TA = 25°C 2.60

Lower threshold voltage (VCC)

TA = 125°C 1.65

V
TA = MIN 3.09
TA = 25°C 80 120

Hysteresis (VCC)

TA = 125°C 10 50

mV
TA = MIN 10 60
TA = 25°C 1.50

Reset threshold voltage (VCC)

TA = 125°C 0.95

V

TA = MIN 1.50

†

All typical values are at TA = 25°C unless otherwise indicated.

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

7

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

short-circuit protection control section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

TA = 25°C 650 700 750

Input threshold voltage (SCP)

TA = 125°C 400 478 550

mV

TA = MIN 800 880 950

Standby voltage (SCP) 140 185 230 mV

TA = 25°C 60 120

Latched input voltage (SCP)

TA = 125°C 70 120

mV

TA = MIN 60 120
Equivalent timing resistance 170 kΩ
Comparator threshold voltage (FEEDBACK) 1.18 V

†

All typical values are at TA = 25°C unless otherwise indicated.

oscillator section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

TA = 25°C 200

Frequency

CT = 330 pF,

TA = 125°C 195

kHz

R

T

= 10

kΩ

TA = MIN 193

Standard deviation of frequency CT = 330 pF, RT = 10 kΩ 2%

TA = 25°C 1%

Frequency change with voltage VCC = 3.6 V to 40 V

TA = 125°C 1%
TA = MIN 3%

Frequency change with temperature 1.37% *±10%

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

dead-time control section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

TA = 25°C 1

Input bias current (DTC)

TA = MIN and 125°C 3

µ

A

Latch mode (source) current (DTC) –80 –145 µA

TA = 25°C 2.30

Latched input voltage (DTC)

TA = 125°C 2.22 2.32

V

TA = MIN 2.28 2.40

p

Zero duty cycle 2.05 *2.25

Input threshold voltage at f

= 10 kHz

(DTC)

Maximum duty cycle *1.20 1.45

V

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

TL1451A
DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

8

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

error-amplifier section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

TA = 25°C ±6

Input offset voltage VO (FEEDBACK) = 1.25 V

TA = 125°C ±10

mV
TA = MIN ±12
TA = 25°C ±100

Input offset current VO (FEEDBACK) = 1.25 V

TA = 125°C ±100

nA
TA = MIN ±200
TA = 25°C 160 500

Input bias current VO (FEEDBACK) = 1.25 V

TA = 125°C 100 500

nA
TA = MIN 142 700

1.05

Common-mode input voltage range VCC = 3.6 V to 40 V

1.05

to

V

gg

CC

1.45

TA = 25°C 70 80

Open-loop voltage amplification RF = 200 kΩ

TA = 125°C 70 80

dB
TA = MIN 64 80

Unity-gain bandwidth 1.5 MHz
Common-mode rejection ratio 60 80 dB
Positive output voltage swing 2 V
Negative output voltage swing 1 V

TA = 25°C 0.5 1.6

Output (sink) current (FEEDBACK) VID = –0.1 V, VO = 1.25 V

TA = 125°C 0.4 1.8

mA
TA = MIN 0.3 1.7
TA = 25°C –45 –70

Output (source) current (FEEDBACK) VID = 0.1 V, VO = 1.25 V

TA = 125°C –25 –50

µA

TA = MIN –15 –70

†

All typical values are at TA = 25°C unless otherwise indicated.

output section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Collector off-state current VO = 50 V 10 µA

TA = 25°C 1.20 2.0

Output saturation voltage

TA = 125°C 1.60 2.4

V

TA = MIN

1.36 2.2

Short-circuit output current VO = 6 V 90 mA

†

All typical values are at TA = 25°C unless otherwise indicated.

pwm comparator section

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

p

Zero duty cycle 2.05 *2.25

Input threshold voltage at f

= 10 kHz

(FEEDBACK)

Maximum duty cycle *1.20 1.45

V

*These parameters are not production tested.
†

All typical values are at TA = 25°C unless otherwise indicated.

TL1451A

DUAL PULSE-WIDTH-MODULATION CONTROL CIRCUITS

SLVS024E – FEBRUARY 1983 – REVISED NOVEMBER 1999

9

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

total device

TL1451AQ, TL1451AM

PARAMETER

TEST CONDITIONS

MIN TYP†MAX

UNIT

Standby supply current Off-state 1.3 1.8 mA
Average supply current RT = 10 kΩ 1.7 2.4 mA

†

All typical values are at TA = 25°C unless otherwise indicated.

PARAMETER MEASUREMENT INFORMATION

87654321

910111213141516

S1

C

PE

0.47 µF

Test

Input

VCC = 5 V

R

L

4.7 kΩ

4.7 kΩ

R

L

OUT1

OUT2

C

T

330 pF

R

T

10 kΩ

Test

Input

TL1451A

Figure 1. Test Circuit

Dead Time 100%

t

pe

†

2.0 V

1.6 V

1.4 V

1.25 V
H

L

H
L

0.6 V
0 V

H
L

3.6 V
0 V

Oscillator Triangle Waveform

Error Amplifier Output

Dead-Time Input Voltage

Short-Circuit Protection

Comparator Input Voltage

PWM Comparator Output Voltage

Output Transistor Collector

Waveform

Protection Enable

Terminal Waveform

Short-Circuit Protection

Comparator Output

Power Supply Voltage

†

Protection Enable Time, tpe = (0.051 x 106 x Cpe) in seconds

2.8 V TYP

Figure 2. TL1451A Timing Diagram